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i was thinking of using a DC 12v 350mA adapter would this one suit or another be better ?

also how long should it charge without overcharging?

Unless the 12V adaptor has a no load voltage of 13.5V or higher, it won't fully charge the battery - when charging, the battery voltage will rise and if the supply is not higher voltage than this, no current will flow - no charging.

If the charge rate is limited to 350 mA, you can charge almost indefinately without battery damage - about twice as high will cause the electrolyte to boil out eventually, though.

12V 20AH Sealed Lead Acid (SLA) Battery for Universal
$40.00Chrome Battery has a huge inventory of the oldest and most reliable type of rechargeable battery, the 12V 20AH Sealed Lead Acid Battery with Nut and Bolt Connectors, also known as an SLA battery. Chrome Battery SLA batteries are 'the workhorse of ALL batteries' and are constructed with lead calcium alloy and absorbed glass mat technology, which allows for completely 'maintenance-free' operation. N...

12V 18AH Sealed Lead Acid Battery for Apc Smart-Ups 1400, 1500 - Mighty Max Battery brand product
$34.99 Delivering power when you need it, the Mighty Max ML18-12 12 Volt 18 AH uses a state of the art, heavy-duty, calcium-alloy grid that provides exceptional performance and service life in both float and cyclic applications. The ML18-12 is an Absorbent Glass Mat (AGM) technology with a valve regulated design, that can be used in enclosed and indoor environments without leaking or maintenance, p...